What is a view in SQL and why would you use it?
This question assesses your knowledge of virtual tables and how they simplify complex queries or secure data access. It checks if you understand the concept of abstraction in databases.
Why Interviewers Ask This
Recruiters ask this to see if you can write maintainable code and protect sensitive data. Views allow you to hide complex logic behind a simple interface, which is crucial for team collaboration. Understanding views also shows you know how to enforce security by restricting column or row access without altering the underlying tables.
How to Answer This Question
Define a view as a virtual table based on a SELECT query that does not store data physically. Explain its benefits: simplifying complex queries, improving readability, and enhancing security. Give examples of using views to restrict access to specific columns or to encapsulate complex joins.
Key Points to Cover
- Views are virtual tables, not physical storage
- They simplify complex query logic
- They enhance security by restricting access
Sample Answer
A view is essentially a saved query that acts like a virtual table. It does not store data itself but presents data from one or more base tables. I use views to simplify complex queries involving multiple joins so that o…
Common Mistakes to Avoid
- Claiming views store data physically
- Failing to mention security benefits
- Not explaining how they simplify queries
Sound confident on this question in 5 minutes
Answer once and get a 30-second AI critique of your structure, content, and delivery. First attempt is free — no signup needed.